Total organic carbons (TOCs) reduction is crucial for a variety of businesses that employ ultrapure water, including microelectronics, medicines, and wastewater treatment.
Netsol Water TOC reduction systems are available in modular skid designs, and can service indoor or outdoor locations. The systems are implemented in important applications around the world, where strict specifications and acceptance are required.
Is TOC reduction possible through UV Disinfection?
Ultraviolet (UV) light is a type of energy that falls within the Electromagnetic Spectrum. This comprises electromagnetic waves, such as cosmic rays, gamma rays, X-rays, UV, visible light, infrared light, and radio waves—all of which are part of the UV energy band.
UV is also used to examine some structural materials, accelerate the aging of some material surfaces, cure or dry inks, create ozone, remove ozone, and reduce total organic carbon (TOC), in ultrapure water treatment applications.
TOC reduction methods use UV light with a wavelength of 185 nanometres. This high energy stimulates the creation of free radicals, which causes organics to be oxidized into CO2 and H2O molecules. The TOCs are decreased, and the oxidation is completed.
The process of UV and TOC reduction
TOCs in water are reduced by three types of UV-induced processes that work to destroy, or remove oxidizable carbons.
1: The main UV/chemical reaction is an oxidation reaction that begins when high-energy 185 nm UV dissociates water molecules, resulting in the formation of hydroxyls. UV-generated hydroxyls are very reactive and rapidly interact with other molecules, such as the hydrocarbon molecules that comprise TOCs.
When hydroxyls react with TOC hydrocarbons, they unite to generate water and carbon dioxide molecules. TOCs are destroyed, and the oxidation process is complete.
2: The second sort of UV reaction that acts to eliminate TOCs is one in which, ultraviolet photons directly breakdown organic molecules. This results in TOC removal/reduction by destruction.
3: When deionization is introduced downstream of a UV reactor, a third UV reaction occurs. TOCs will be ionized by ultraviolet energy, allowing them to be removed later by a deionization device.
TOC dosage reduction
The energy produced by 185-nm TOC reduction UV systems is significantly more than that, produced by standard 254-nm disinfection UV systems. This is accomplished by employing higher-energy 185-nm lamps and constructing TOC-UV reduction devices, which work at significantly higher dosage levels than standard water disinfection.
Benefits of using UV in TOC Reduction
· Minimalist footprint.
· Skid designs that are modular.
· Installations can be used indoors or outdoors.
· Low operating and maintenance expenses.
· Reactor design for certain applications.
· Engineered to meet or surpass TOC specifications of 1ppb.
Total organic carbons are frequently a concern when ultrapure water is used to rinse, electronic components during production. These trace TOC compounds have the potential to produce major flaws in semiconductors, where even the smallest contaminants can degrade performance, as well as accelerate the proliferation of microorganisms that feed on these organic impurities.
Some TOC reduction can be achieved by employing activated carbon filters and reverse osmosis (RO) or deionization (DI) systems; however, UV is typically used as the final stage in TOC water treatment to obtain very high levels of TOC reduction.
How can we assist?
By definition, ultrapure water is extremely pure. UV light easily penetrates clean water, resulting in a "high" UV transmission factor in TOC applications.
Employing UV for TOC reduction has the added benefit of producing considerable amounts of 254 nm output, which provides high levels of microbial reduction (disinfection). Netsol Water have well established UV systems, which can help you lower TOC levels in water.
We have earned a reputation for providing top-notch service and solutions, which will help our clients lower operating expenses and increase the life of their equipment.